the UK has about 650 total murders a year compared to about 14500 per year in the USA. The sample size is hard to compare, since there were so few handgun murders in UK even before the handgun ban, saying the ban led to a rise or fall in the murder rate is meaningless.
There is a graph by gun activists showing that after a crackdown on handguns in 1996 in England, there were more total murders after that. But that's pretty much not connected, since regular people just don't cart guns around for self-protection in the UK or Australia. It's just not part of the culture or what normal people do, unless you are a farmer (which is about 1% of the population) and you might have a .22 rifle and a shotgun.
Handguns are the MAIN choice of weapon for murders in the USA, so total murder rate after changes in handgun ownership rates are meaningful. Handguns are a RARE form of murder in most western countries, so total murder rate changes before or after a gun control policy changes don't really say anything.
I grew up in country Australia (in a town) and can't even remember seeing a real gun. Only people who are actual farmers with actual sheep and cows even had that shit. I literally cannot remember any time in my whole life that I have actually seen a working gun except on TV or in a sporting goods shop.
I've had friends on all sorts of drugs, run ins with criminals, robberies, lived everywhere from the countryside to inner-city slum neighborhoods considered some of the worst in Australia. I have never met anyone with a gun. I've even heard of heroin users that I knew getting home invaded by a gang. EVEN THAT GANG were not armed with guns. I'm sure it happens, it's just never happened to anyone I ever met, even in the roughest neighborhoods in the country.